Dell Networking 2024 Reference Manual page 886

Manual
Ports operating in the Manual role do not have their configuration affected
by peer devices or by internal propagation of configuration. These ports have
their operational mode and TC and bandwidth information specified
explicitly by the operator. These ports will advertise their configuration to
their peer if DCBX is enabled on that port. Incompatible peer configurations
will be logged and counted with an error counter.
The default operating mode for each port is Manual for Dell Networking
releases; however, customer platforms may change the default mode for
selected ports to either Auto-Upstream or Auto-Downstream mode. An
example of this would be a blade switch that needed to support touchless
configuration and has certain ports that are upstream ports and other ports
that are downstream ports. A port that is set to manual mode sets the willing
bit for DCBX client TLVs to false. Manually configured ports never internally
propagate or accept internal or external configuration from other ports.
Manually configured ports may notify the operator of incompatible
configurations if client configuration exchange over DCBX is enabled.
Manually configured ports are always operationally enabled for DCBX clients,
regardless of whether DCBX is enabled.
Auto-Upstream
Advertises a configuration, but is also willing to accept a configuration from
the link-partner and propagate it internally to the auto-downstream ports as
well as receive configuration propagated internally by other auto-upstream
ports. The local configuration parameters for PFC and ETS, if any, are
overridden with the negotiated configuration. Specifically, the willing
parameter is enabled on the port and the recommendation TLV is sent to the
peer and processed if received locally. The first auto-upstream port to
successfully accept a compatible configuration becomes the configuration
source. The configuration source propagates its configuration to other auto-
upstream and auto-downstream ports. Only the configuration source may
propagate configuration to other ports internally. Auto-upstream ports that
receive internally propagated information ignore their local configuration and
utilize the internally propagated information.
Peer configurations received on auto-upstream ports other than the
configuration source result in one of two possibilities.
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Data Center Bridging Commands